Support for TLS 1.2

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*   Trying 167.89.118.69:443...
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* Connected to tls12.api.sendgrid.com (167.89.118.69) port 443 (#0)
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* ALPN, offering h2
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* ALPN, offering http/1.1
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* successfully set certificate verify locations:
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*  CAfile: /etc/ssl/cert.pem
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*  CApath: none
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* (304) (OUT), TLS handshake, Client hello (1):
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* (304) (IN), TLS handshake, Server hello (2):
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* TLSv1.2 (IN), TLS handshake, Certificate (11):
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* TLSv1.2 (IN), TLS handshake, Server key exchange (12):
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* TLSv1.2 (IN), TLS handshake, Server finished (14):
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* TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
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* TLSv1.2 (OUT), TLS change cipher, Change cipher spec (1):
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* TLSv1.2 (OUT), TLS handshake, Finished (20):
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* TLSv1.2 (IN), TLS change cipher, Change cipher spec (1):
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* TLSv1.2 (IN), TLS handshake, Finished (20):
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* SSL connection using TLSv1.2 / ECDHE-RSA-AES128-GCM-SHA256
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...
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* Connection #0 to host tls12.api.sendgrid.com left intact

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curl https://tls12.api.sendgrid.com/v3/mail/send \
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  --tlsv1.2 \
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  --header 'Authorization: Bearer <<YOUR API KEY>>' \
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  --header 'Content-Type: application/json' \
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  --data '{"personalizations": [{"to": [{"email": "recipient@example.com"}]}],"from": {"email": "sender@example.com"},"subject": "Hello, World!","content": [{"type": "text/plain", "value": "Hello from SendGrid!"}]}'

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SSL handshake has read 5793 bytes and written 322 bytes
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...
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SSL-Session:
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    Protocol  : TLSv1.2
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    Cipher    : ECDHE-RSA-AES256-GCM-SHA384
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...

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using SendGrid;
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using SendGrid.Helpers.Mail;
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var apiKey = Environment.GetEnvironmentVariable("SENDGRID_API_KEY");
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// Override host with TLS 1.2+ endpoint
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var host = "https://tls12.api.sendgrid.com";
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var client = new SendGridClient(apiKey, host);
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var from = new EmailAddress("sender@example.com", "Sender");
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var subject = "Sending with Twilio SendGrid is Fun";
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var to = new EmailAddress("recipient@example.com", "Recipient");
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var plainTextContent = "and easy to do anywhere with C#.";
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var htmlContent = "<strong>and easy to do anywhere with C#</strong>.";
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var message = MailHelper.CreateSingleEmail(from, to, subject, plainTextContent, htmlContent);
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var response = await client.SendEmailAsync(message);
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Console.WriteLine($"Response status code: {response.StatusCode}");
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Console.WriteLine($"Response body: {await response.Body.ReadAsStringAsync()}");

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package main
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import (
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    "fmt"
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    "log"
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    "os"
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    "github.com/sendgrid/sendgrid-go"
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    "github.com/sendgrid/sendgrid-go/helpers/mail"
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)
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// Override default client to accept TLS 1.2 test host
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func NewSendClient(key string, host string) *sendgrid.Client {
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    request := sendgrid.GetRequest(key, "/v3/mail/send", host)
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    request.Method = "POST"
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    return &sendgrid.Client{Request: request}
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}
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func main() {
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    from := mail.NewEmail("Sender", "sender@example.com")
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    subject := "Sending with Twilio SendGrid is Fun"
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    to := mail.NewEmail("Recipient", "recipient@example.com")
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    plainTextContent := "and easy to do anywhere with Go."
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    htmlContent := "<strong>and easy to do anywhere with Go.</strong>"
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    message := mail.NewSingleEmail(from, subject, to, plainTextContent, htmlContent)
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    // Use TLS 1.2+ endpoint as host
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    client := NewSendClient(os.Getenv("SENDGRID_API_KEY"), "https://tls12.api.sendgrid.com")
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    response, err := client.Send(message)
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    if err != nil {
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        log.Println(err)
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    } else {
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        fmt.Println(response.StatusCode)
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        fmt.Println(response.Headers)
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    }
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}

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import com.sendgrid.*;
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import java.io.IOException;
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public class Example {
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  public static void main(String[] args) throws IOException {
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    Email from = new Email("sender@example.com");
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    String subject = "Sending with Twilio SendGrid is Fun";
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    Email to = new Email("recipient@example.com");
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    Content content = new Content("text/plain", "and easy to do anywhere with Java.");
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    Mail mail = new Mail(from, subject, to, content);
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    SendGrid sg = new SendGrid(System.getenv("SENDGRID_API_KEY"));
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    // Override host with TLS 1.2+ endpoint
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    sg.setHost("tls12.api.sendgrid.com");
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    Request request = new Request();
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    try {
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      request.setMethod(Method.POST);
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      request.setEndpoint("mail/send");
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      request.setBody(mail.build());
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      Response response = sg.api(request);
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      System.out.println(response.getStatusCode());
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      System.out.println(response.getBody());
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      System.out.println(response.getHeaders());
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    } catch (IOException ex) {
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      throw ex;
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    }
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  }
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}

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const sgMail = require("@sendgrid/mail");
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const client = require("@sendgrid/client");
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// Override baseUrl to use TLS 1.2+ test endpoint
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client.setApiKey(process.env.SENDGRID_API_KEY);
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client.setDefaultRequest("baseUrl", "https://tls12.api.sendgrid.com");
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sgMail.setClient(client);
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const msg = {
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  to: "recipient@example.com",
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  from: "sender@example.com",
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  subject: "Sending with Twilio SendGrid is Fun",
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  text: "and easy to do anywhere with NodeJS.",
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  html: "<strong>and easy to do anywhere with NodeJS.</strong>",
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};
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sgMail.send(msg).then(
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  () => {},
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  (error) => {
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    console.error(error);
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    if (error.response) {
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      console.error(error.response.body);
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    }
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  }
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);

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<?php
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declare(strict_types=1);
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require 'vendor/autoload.php';
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use \SendGrid\Mail\Mail;
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$email = new Mail();
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// Replace the email address and name with your verified sender
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$email->setFrom(
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    'sender@example.com',
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    'Example Sender'
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);
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$email->setSubject('Sending with Twilio SendGrid is Fun');
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// Replace the email address and name with your recipient
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$email->addTo(
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    'recipient@example.com',
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    'Example Recipient'
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);
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$email->addContent(
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    'text/html',
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    '<strong>and easy to do anywhere with PHP.</strong>'
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);
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// Pass the SendGrid class an options array with the TLS 1.2+ host
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$sendgrid = new \SendGrid(
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    getenv('SENDGRID_API_KEY'),
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    ['host' => 'https://tls12.api.sendgrid.com']
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);
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try {
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    $response = $sendgrid->send($email);
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    printf("Response status: %d\n\n", $response->statusCode());
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    $headers = array_filter($response->headers());
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    echo "Response Headers\n\n";
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    foreach ($headers as $header) {
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        echo '- ' . $header . "\n";
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    }
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} catch (Exception $e) {
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    echo 'Caught exception: ' . $e->getMessage() . "\n";
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}

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import sendgrid
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import os
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from sendgrid.helpers.mail import *
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# Set host to the TLS 1.2+ test endpoint
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sg = sendgrid.SendGridAPIClient(
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    host='https://tls12.api.sendgrid.com',
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    api_key=os.environ.get('SENDGRID_API_KEY')
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)
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from_email = Email("sender@example.com")
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to_email = To("recipient@example.com")
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subject = "Sending with SendGrid is Fun"
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content = Content("text/plain", "and easy to do anywhere with Python.")
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mail = Mail(from_email, to_email, subject, content)
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response = sg.client.mail.send.post(request_body=mail.get())
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print(response.status_code)
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print(response.body)
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print(response.headers)

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require 'sendgrid-ruby'
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include SendGrid
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from = SendGrid::Email.new(email: 'sender@example.com', name: "Sender")
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to = SendGrid::Email.new(email: 'recipient@example.com', name: "Recipient")
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subject = 'Sending with Twilio SendGrid is Fun'
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content = SendGrid::Content.new(type: 'text/html', value: 'and easy to do anywhere with Ruby.')
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mail = SendGrid::Mail.new(from, subject, to, content)
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# Set host to TLS 1.2 test endpoint
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sg = SendGrid::API.new(api_key: ENV['SENDGRID_API_KEY'], host: 'https://tls12.api.sendgrid.com')
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response = sg.client.mail._('send').post(request_body: mail.to_json)
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puts response.status_code
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puts response.headers

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# Port 25 startTLS 
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openssl s_client -connect tls12.smtp.sendgrid.net:25 -starttls smtp -tls1_2
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# Port 465 SSL 
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openssl s_client -connect tls12.smtp.sendgrid.net:465 -tls1_2

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SSL handshake has read 5779 bytes and written 322 bytes
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...
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SSL-Session:
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    Protocol  : TLSv1.2
5
    Cipher    : ECDHE-RSA-AES256-GCM-SHA384
6
...